I have only had the truck 1 year. It used to be at the full mark now it is 1/4 full when was the first time you had to add coolant? I haven't seen any leaks and it's not losing it fast enough to make me think there is one, normal?

When did you check it? Was the engine hot or cold? This will affect the level. The owner's manual should give you an approximation, but I tend to ensure it's somewhere in the middle of min/max when cold. That way when the radiator heats up, the overflow won't go beyond full.

I replaced my fluid at 60k miles...but I do have to top it off probably once a year.

I would take it in and let the dealer pressure test it for leaks. I've only had mine for a year and 10K miles (52K on the truck), the coolant may have dropped a 1/4 of an inch. And most of that is seeping out of the hose on top of the overflow bottle. Just added a ziptie to that hose to stop the seeping.

Look at your radiator cap. Is it seated properly? Is there any 'white' residue around it?

I was loosing coolant also and I traced the leak to the radiator cap. I took it in to Toyota (warrantee) and told them I thought it was a bad radiator cap. They replaced the cap & refilled my resevoir. It's been fine ever since.

I never added any to the reservoir. Had my fluid changed at 5 1/2 years (88K miles). The reservoir was low but above the "Min" or "Low" line. In researching old threads on TW, I discovered it was normal for it to go down over time due to evaporation. My only weird situation is the air in the lines in the cabin (even after the fluid was changed). When I have the thermostat turned up, the first time it lets the fluid pass through the lines in the cabin it will make a gurgling sound behind the instrument cluster where the lines come thru the firewall. But with no leaks and no loss of fluid, must just be a design situation.